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899 lines
30 KiB
899 lines
30 KiB
1 week ago
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#
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# The Python Imaging Library
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# $Id$
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#
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# drawing interface operations
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#
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# History:
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# 1996-04-13 fl Created (experimental)
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# 1996-08-07 fl Filled polygons, ellipses.
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# 1996-08-13 fl Added text support
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# 1998-06-28 fl Handle I and F images
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# 1998-12-29 fl Added arc; use arc primitive to draw ellipses
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# 1999-01-10 fl Added shape stuff (experimental)
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# 1999-02-06 fl Added bitmap support
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# 1999-02-11 fl Changed all primitives to take options
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# 1999-02-20 fl Fixed backwards compatibility
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# 2000-10-12 fl Copy on write, when necessary
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# 2001-02-18 fl Use default ink for bitmap/text also in fill mode
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# 2002-10-24 fl Added support for CSS-style color strings
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# 2002-12-10 fl Added experimental support for RGBA-on-RGB drawing
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# 2002-12-11 fl Refactored low-level drawing API (work in progress)
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# 2004-08-26 fl Made Draw() a factory function, added getdraw() support
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# 2004-09-04 fl Added width support to line primitive
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# 2004-09-10 fl Added font mode handling
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# 2006-06-19 fl Added font bearing support (getmask2)
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#
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# Copyright (c) 1997-2006 by Secret Labs AB
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# Copyright (c) 1996-2006 by Fredrik Lundh
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#
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# See the README file for information on usage and redistribution.
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#
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import math
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import numbers
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from . import Image, ImageColor
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"""
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A simple 2D drawing interface for PIL images.
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<p>
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Application code should use the <b>Draw</b> factory, instead of
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directly.
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"""
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class ImageDraw:
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def __init__(self, im, mode=None):
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"""
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Create a drawing instance.
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:param im: The image to draw in.
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:param mode: Optional mode to use for color values. For RGB
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images, this argument can be RGB or RGBA (to blend the
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drawing into the image). For all other modes, this argument
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must be the same as the image mode. If omitted, the mode
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defaults to the mode of the image.
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"""
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im.load()
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if im.readonly:
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im._copy() # make it writeable
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blend = 0
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if mode is None:
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mode = im.mode
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if mode != im.mode:
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if mode == "RGBA" and im.mode == "RGB":
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blend = 1
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else:
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raise ValueError("mode mismatch")
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if mode == "P":
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self.palette = im.palette
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else:
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self.palette = None
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self.im = im.im
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self.draw = Image.core.draw(self.im, blend)
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self.mode = mode
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if mode in ("I", "F"):
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self.ink = self.draw.draw_ink(1)
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else:
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self.ink = self.draw.draw_ink(-1)
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if mode in ("1", "P", "I", "F"):
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# FIXME: fix Fill2 to properly support matte for I+F images
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self.fontmode = "1"
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else:
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self.fontmode = "L" # aliasing is okay for other modes
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self.fill = 0
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self.font = None
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def getfont(self):
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"""
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Get the current default font.
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:returns: An image font."""
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if not self.font:
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# FIXME: should add a font repository
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from . import ImageFont
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self.font = ImageFont.load_default()
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return self.font
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def _getink(self, ink, fill=None):
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if ink is None and fill is None:
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if self.fill:
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fill = self.ink
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else:
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ink = self.ink
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else:
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if ink is not None:
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if isinstance(ink, str):
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ink = ImageColor.getcolor(ink, self.mode)
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if self.palette and not isinstance(ink, numbers.Number):
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ink = self.palette.getcolor(ink)
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ink = self.draw.draw_ink(ink)
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if fill is not None:
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if isinstance(fill, str):
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fill = ImageColor.getcolor(fill, self.mode)
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if self.palette and not isinstance(fill, numbers.Number):
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fill = self.palette.getcolor(fill)
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fill = self.draw.draw_ink(fill)
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return ink, fill
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def arc(self, xy, start, end, fill=None, width=1):
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"""Draw an arc."""
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ink, fill = self._getink(fill)
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if ink is not None:
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self.draw.draw_arc(xy, start, end, ink, width)
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def bitmap(self, xy, bitmap, fill=None):
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"""Draw a bitmap."""
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bitmap.load()
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ink, fill = self._getink(fill)
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if ink is None:
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ink = fill
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if ink is not None:
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self.draw.draw_bitmap(xy, bitmap.im, ink)
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def chord(self, xy, start, end, fill=None, outline=None, width=1):
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"""Draw a chord."""
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ink, fill = self._getink(outline, fill)
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if fill is not None:
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self.draw.draw_chord(xy, start, end, fill, 1)
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if ink is not None and ink != fill and width != 0:
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self.draw.draw_chord(xy, start, end, ink, 0, width)
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def ellipse(self, xy, fill=None, outline=None, width=1):
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"""Draw an ellipse."""
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ink, fill = self._getink(outline, fill)
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if fill is not None:
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self.draw.draw_ellipse(xy, fill, 1)
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if ink is not None and ink != fill and width != 0:
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self.draw.draw_ellipse(xy, ink, 0, width)
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def line(self, xy, fill=None, width=0, joint=None):
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"""Draw a line, or a connected sequence of line segments."""
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ink = self._getink(fill)[0]
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if ink is not None:
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self.draw.draw_lines(xy, ink, width)
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if joint == "curve" and width > 4:
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if not isinstance(xy[0], (list, tuple)):
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xy = [tuple(xy[i : i + 2]) for i in range(0, len(xy), 2)]
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for i in range(1, len(xy) - 1):
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point = xy[i]
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angles = [
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math.degrees(math.atan2(end[0] - start[0], start[1] - end[1]))
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% 360
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for start, end in ((xy[i - 1], point), (point, xy[i + 1]))
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]
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if angles[0] == angles[1]:
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# This is a straight line, so no joint is required
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continue
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def coord_at_angle(coord, angle):
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x, y = coord
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angle -= 90
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distance = width / 2 - 1
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return tuple(
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[
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p + (math.floor(p_d) if p_d > 0 else math.ceil(p_d))
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for p, p_d in (
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(x, distance * math.cos(math.radians(angle))),
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(y, distance * math.sin(math.radians(angle))),
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)
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]
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)
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flipped = (
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angles[1] > angles[0] and angles[1] - 180 > angles[0]
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) or (angles[1] < angles[0] and angles[1] + 180 > angles[0])
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coords = [
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(point[0] - width / 2 + 1, point[1] - width / 2 + 1),
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(point[0] + width / 2 - 1, point[1] + width / 2 - 1),
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]
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if flipped:
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start, end = (angles[1] + 90, angles[0] + 90)
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else:
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start, end = (angles[0] - 90, angles[1] - 90)
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self.pieslice(coords, start - 90, end - 90, fill)
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if width > 8:
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# Cover potential gaps between the line and the joint
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if flipped:
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gapCoords = [
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coord_at_angle(point, angles[0] + 90),
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point,
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coord_at_angle(point, angles[1] + 90),
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]
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else:
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gapCoords = [
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coord_at_angle(point, angles[0] - 90),
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point,
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coord_at_angle(point, angles[1] - 90),
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]
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self.line(gapCoords, fill, width=3)
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def shape(self, shape, fill=None, outline=None):
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"""(Experimental) Draw a shape."""
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shape.close()
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ink, fill = self._getink(outline, fill)
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if fill is not None:
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self.draw.draw_outline(shape, fill, 1)
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if ink is not None and ink != fill:
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self.draw.draw_outline(shape, ink, 0)
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def pieslice(self, xy, start, end, fill=None, outline=None, width=1):
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"""Draw a pieslice."""
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ink, fill = self._getink(outline, fill)
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if fill is not None:
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self.draw.draw_pieslice(xy, start, end, fill, 1)
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if ink is not None and ink != fill and width != 0:
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self.draw.draw_pieslice(xy, start, end, ink, 0, width)
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def point(self, xy, fill=None):
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"""Draw one or more individual pixels."""
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ink, fill = self._getink(fill)
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if ink is not None:
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self.draw.draw_points(xy, ink)
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def polygon(self, xy, fill=None, outline=None):
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"""Draw a polygon."""
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ink, fill = self._getink(outline, fill)
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if fill is not None:
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self.draw.draw_polygon(xy, fill, 1)
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if ink is not None and ink != fill:
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self.draw.draw_polygon(xy, ink, 0)
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def regular_polygon(
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self, bounding_circle, n_sides, rotation=0, fill=None, outline=None
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):
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"""Draw a regular polygon."""
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xy = _compute_regular_polygon_vertices(bounding_circle, n_sides, rotation)
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self.polygon(xy, fill, outline)
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def rectangle(self, xy, fill=None, outline=None, width=1):
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"""Draw a rectangle."""
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ink, fill = self._getink(outline, fill)
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if fill is not None:
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self.draw.draw_rectangle(xy, fill, 1)
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if ink is not None and ink != fill and width != 0:
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self.draw.draw_rectangle(xy, ink, 0, width)
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def _multiline_check(self, text):
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"""Draw text."""
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split_character = "\n" if isinstance(text, str) else b"\n"
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return split_character in text
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def _multiline_split(self, text):
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split_character = "\n" if isinstance(text, str) else b"\n"
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return text.split(split_character)
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def text(
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self,
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xy,
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text,
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fill=None,
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font=None,
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anchor=None,
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spacing=4,
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align="left",
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direction=None,
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features=None,
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language=None,
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stroke_width=0,
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stroke_fill=None,
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embedded_color=False,
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*args,
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**kwargs,
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):
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if self._multiline_check(text):
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return self.multiline_text(
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xy,
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text,
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fill,
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font,
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anchor,
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spacing,
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align,
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direction,
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features,
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language,
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stroke_width,
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stroke_fill,
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embedded_color,
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)
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if embedded_color and self.mode not in ("RGB", "RGBA"):
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raise ValueError("Embedded color supported only in RGB and RGBA modes")
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if font is None:
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font = self.getfont()
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def getink(fill):
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ink, fill = self._getink(fill)
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if ink is None:
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return fill
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return ink
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|
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def draw_text(ink, stroke_width=0, stroke_offset=None):
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mode = self.fontmode
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if stroke_width == 0 and embedded_color:
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mode = "RGBA"
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coord = xy
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try:
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mask, offset = font.getmask2(
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text,
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mode,
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direction=direction,
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features=features,
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language=language,
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stroke_width=stroke_width,
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anchor=anchor,
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ink=ink,
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|
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*args,
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**kwargs,
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)
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coord = coord[0] + offset[0], coord[1] + offset[1]
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except AttributeError:
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||
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try:
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mask = font.getmask(
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text,
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mode,
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||
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direction,
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||
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features,
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||
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language,
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||
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stroke_width,
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||
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anchor,
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||
|
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ink,
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||
|
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*args,
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||
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**kwargs,
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||
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)
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except TypeError:
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mask = font.getmask(text)
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|
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if stroke_offset:
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coord = coord[0] + stroke_offset[0], coord[1] + stroke_offset[1]
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|
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if mode == "RGBA":
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# font.getmask2(mode="RGBA") returns color in RGB bands and mask in A
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||
|
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# extract mask and set text alpha
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||
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color, mask = mask, mask.getband(3)
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color.fillband(3, (ink >> 24) & 0xFF)
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||
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coord2 = coord[0] + mask.size[0], coord[1] + mask.size[1]
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|
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self.im.paste(color, coord + coord2, mask)
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||
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else:
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self.draw.draw_bitmap(coord, mask, ink)
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||
|
|
|
||
|
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ink = getink(fill)
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||
|
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if ink is not None:
|
||
|
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stroke_ink = None
|
||
|
|
if stroke_width:
|
||
|
|
stroke_ink = getink(stroke_fill) if stroke_fill is not None else ink
|
||
|
|
|
||
|
|
if stroke_ink is not None:
|
||
|
|
# Draw stroked text
|
||
|
|
draw_text(stroke_ink, stroke_width)
|
||
|
|
|
||
|
|
# Draw normal text
|
||
|
|
draw_text(ink, 0)
|
||
|
|
else:
|
||
|
|
# Only draw normal text
|
||
|
|
draw_text(ink)
|
||
|
|
|
||
|
|
def multiline_text(
|
||
|
|
self,
|
||
|
|
xy,
|
||
|
|
text,
|
||
|
|
fill=None,
|
||
|
|
font=None,
|
||
|
|
anchor=None,
|
||
|
|
spacing=4,
|
||
|
|
align="left",
|
||
|
|
direction=None,
|
||
|
|
features=None,
|
||
|
|
language=None,
|
||
|
|
stroke_width=0,
|
||
|
|
stroke_fill=None,
|
||
|
|
embedded_color=False,
|
||
|
|
):
|
||
|
|
if direction == "ttb":
|
||
|
|
raise ValueError("ttb direction is unsupported for multiline text")
|
||
|
|
|
||
|
|
if anchor is None:
|
||
|
|
anchor = "la"
|
||
|
|
elif len(anchor) != 2:
|
||
|
|
raise ValueError("anchor must be a 2 character string")
|
||
|
|
elif anchor[1] in "tb":
|
||
|
|
raise ValueError("anchor not supported for multiline text")
|
||
|
|
|
||
|
|
widths = []
|
||
|
|
max_width = 0
|
||
|
|
lines = self._multiline_split(text)
|
||
|
|
line_spacing = (
|
||
|
|
self.textsize("A", font=font, stroke_width=stroke_width)[1] + spacing
|
||
|
|
)
|
||
|
|
for line in lines:
|
||
|
|
line_width = self.textlength(
|
||
|
|
line, font, direction=direction, features=features, language=language
|
||
|
|
)
|
||
|
|
widths.append(line_width)
|
||
|
|
max_width = max(max_width, line_width)
|
||
|
|
|
||
|
|
top = xy[1]
|
||
|
|
if anchor[1] == "m":
|
||
|
|
top -= (len(lines) - 1) * line_spacing / 2.0
|
||
|
|
elif anchor[1] == "d":
|
||
|
|
top -= (len(lines) - 1) * line_spacing
|
||
|
|
|
||
|
|
for idx, line in enumerate(lines):
|
||
|
|
left = xy[0]
|
||
|
|
width_difference = max_width - widths[idx]
|
||
|
|
|
||
|
|
# first align left by anchor
|
||
|
|
if anchor[0] == "m":
|
||
|
|
left -= width_difference / 2.0
|
||
|
|
elif anchor[0] == "r":
|
||
|
|
left -= width_difference
|
||
|
|
|
||
|
|
# then align by align parameter
|
||
|
|
if align == "left":
|
||
|
|
pass
|
||
|
|
elif align == "center":
|
||
|
|
left += width_difference / 2.0
|
||
|
|
elif align == "right":
|
||
|
|
left += width_difference
|
||
|
|
else:
|
||
|
|
raise ValueError('align must be "left", "center" or "right"')
|
||
|
|
|
||
|
|
self.text(
|
||
|
|
(left, top),
|
||
|
|
line,
|
||
|
|
fill,
|
||
|
|
font,
|
||
|
|
anchor,
|
||
|
|
direction=direction,
|
||
|
|
features=features,
|
||
|
|
language=language,
|
||
|
|
stroke_width=stroke_width,
|
||
|
|
stroke_fill=stroke_fill,
|
||
|
|
embedded_color=embedded_color,
|
||
|
|
)
|
||
|
|
top += line_spacing
|
||
|
|
|
||
|
|
def textsize(
|
||
|
|
self,
|
||
|
|
text,
|
||
|
|
font=None,
|
||
|
|
spacing=4,
|
||
|
|
direction=None,
|
||
|
|
features=None,
|
||
|
|
language=None,
|
||
|
|
stroke_width=0,
|
||
|
|
):
|
||
|
|
"""Get the size of a given string, in pixels."""
|
||
|
|
if self._multiline_check(text):
|
||
|
|
return self.multiline_textsize(
|
||
|
|
text, font, spacing, direction, features, language, stroke_width
|
||
|
|
)
|
||
|
|
|
||
|
|
if font is None:
|
||
|
|
font = self.getfont()
|
||
|
|
return font.getsize(text, direction, features, language, stroke_width)
|
||
|
|
|
||
|
|
def multiline_textsize(
|
||
|
|
self,
|
||
|
|
text,
|
||
|
|
font=None,
|
||
|
|
spacing=4,
|
||
|
|
direction=None,
|
||
|
|
features=None,
|
||
|
|
language=None,
|
||
|
|
stroke_width=0,
|
||
|
|
):
|
||
|
|
max_width = 0
|
||
|
|
lines = self._multiline_split(text)
|
||
|
|
line_spacing = (
|
||
|
|
self.textsize("A", font=font, stroke_width=stroke_width)[1] + spacing
|
||
|
|
)
|
||
|
|
for line in lines:
|
||
|
|
line_width, line_height = self.textsize(
|
||
|
|
line, font, spacing, direction, features, language, stroke_width
|
||
|
|
)
|
||
|
|
max_width = max(max_width, line_width)
|
||
|
|
return max_width, len(lines) * line_spacing - spacing
|
||
|
|
|
||
|
|
def textlength(
|
||
|
|
self,
|
||
|
|
text,
|
||
|
|
font=None,
|
||
|
|
direction=None,
|
||
|
|
features=None,
|
||
|
|
language=None,
|
||
|
|
embedded_color=False,
|
||
|
|
):
|
||
|
|
"""Get the length of a given string, in pixels with 1/64 precision."""
|
||
|
|
if self._multiline_check(text):
|
||
|
|
raise ValueError("can't measure length of multiline text")
|
||
|
|
if embedded_color and self.mode not in ("RGB", "RGBA"):
|
||
|
|
raise ValueError("Embedded color supported only in RGB and RGBA modes")
|
||
|
|
|
||
|
|
if font is None:
|
||
|
|
font = self.getfont()
|
||
|
|
mode = "RGBA" if embedded_color else self.fontmode
|
||
|
|
try:
|
||
|
|
return font.getlength(text, mode, direction, features, language)
|
||
|
|
except AttributeError:
|
||
|
|
size = self.textsize(
|
||
|
|
text, font, direction=direction, features=features, language=language
|
||
|
|
)
|
||
|
|
if direction == "ttb":
|
||
|
|
return size[1]
|
||
|
|
return size[0]
|
||
|
|
|
||
|
|
def textbbox(
|
||
|
|
self,
|
||
|
|
xy,
|
||
|
|
text,
|
||
|
|
font=None,
|
||
|
|
anchor=None,
|
||
|
|
spacing=4,
|
||
|
|
align="left",
|
||
|
|
direction=None,
|
||
|
|
features=None,
|
||
|
|
language=None,
|
||
|
|
stroke_width=0,
|
||
|
|
embedded_color=False,
|
||
|
|
):
|
||
|
|
"""Get the bounding box of a given string, in pixels."""
|
||
|
|
if embedded_color and self.mode not in ("RGB", "RGBA"):
|
||
|
|
raise ValueError("Embedded color supported only in RGB and RGBA modes")
|
||
|
|
|
||
|
|
if self._multiline_check(text):
|
||
|
|
return self.multiline_textbbox(
|
||
|
|
xy,
|
||
|
|
text,
|
||
|
|
font,
|
||
|
|
anchor,
|
||
|
|
spacing,
|
||
|
|
align,
|
||
|
|
direction,
|
||
|
|
features,
|
||
|
|
language,
|
||
|
|
stroke_width,
|
||
|
|
embedded_color,
|
||
|
|
)
|
||
|
|
|
||
|
|
if font is None:
|
||
|
|
font = self.getfont()
|
||
|
|
mode = "RGBA" if embedded_color else self.fontmode
|
||
|
|
bbox = font.getbbox(
|
||
|
|
text, mode, direction, features, language, stroke_width, anchor
|
||
|
|
)
|
||
|
|
return bbox[0] + xy[0], bbox[1] + xy[1], bbox[2] + xy[0], bbox[3] + xy[1]
|
||
|
|
|
||
|
|
def multiline_textbbox(
|
||
|
|
self,
|
||
|
|
xy,
|
||
|
|
text,
|
||
|
|
font=None,
|
||
|
|
anchor=None,
|
||
|
|
spacing=4,
|
||
|
|
align="left",
|
||
|
|
direction=None,
|
||
|
|
features=None,
|
||
|
|
language=None,
|
||
|
|
stroke_width=0,
|
||
|
|
embedded_color=False,
|
||
|
|
):
|
||
|
|
if direction == "ttb":
|
||
|
|
raise ValueError("ttb direction is unsupported for multiline text")
|
||
|
|
|
||
|
|
if anchor is None:
|
||
|
|
anchor = "la"
|
||
|
|
elif len(anchor) != 2:
|
||
|
|
raise ValueError("anchor must be a 2 character string")
|
||
|
|
elif anchor[1] in "tb":
|
||
|
|
raise ValueError("anchor not supported for multiline text")
|
||
|
|
|
||
|
|
widths = []
|
||
|
|
max_width = 0
|
||
|
|
lines = self._multiline_split(text)
|
||
|
|
line_spacing = (
|
||
|
|
self.textsize("A", font=font, stroke_width=stroke_width)[1] + spacing
|
||
|
|
)
|
||
|
|
for line in lines:
|
||
|
|
line_width = self.textlength(
|
||
|
|
line,
|
||
|
|
font,
|
||
|
|
direction=direction,
|
||
|
|
features=features,
|
||
|
|
language=language,
|
||
|
|
embedded_color=embedded_color,
|
||
|
|
)
|
||
|
|
widths.append(line_width)
|
||
|
|
max_width = max(max_width, line_width)
|
||
|
|
|
||
|
|
top = xy[1]
|
||
|
|
if anchor[1] == "m":
|
||
|
|
top -= (len(lines) - 1) * line_spacing / 2.0
|
||
|
|
elif anchor[1] == "d":
|
||
|
|
top -= (len(lines) - 1) * line_spacing
|
||
|
|
|
||
|
|
bbox = None
|
||
|
|
|
||
|
|
for idx, line in enumerate(lines):
|
||
|
|
left = xy[0]
|
||
|
|
width_difference = max_width - widths[idx]
|
||
|
|
|
||
|
|
# first align left by anchor
|
||
|
|
if anchor[0] == "m":
|
||
|
|
left -= width_difference / 2.0
|
||
|
|
elif anchor[0] == "r":
|
||
|
|
left -= width_difference
|
||
|
|
|
||
|
|
# then align by align parameter
|
||
|
|
if align == "left":
|
||
|
|
pass
|
||
|
|
elif align == "center":
|
||
|
|
left += width_difference / 2.0
|
||
|
|
elif align == "right":
|
||
|
|
left += width_difference
|
||
|
|
else:
|
||
|
|
raise ValueError('align must be "left", "center" or "right"')
|
||
|
|
|
||
|
|
bbox_line = self.textbbox(
|
||
|
|
(left, top),
|
||
|
|
line,
|
||
|
|
font,
|
||
|
|
anchor,
|
||
|
|
direction=direction,
|
||
|
|
features=features,
|
||
|
|
language=language,
|
||
|
|
stroke_width=stroke_width,
|
||
|
|
embedded_color=embedded_color,
|
||
|
|
)
|
||
|
|
if bbox is None:
|
||
|
|
bbox = bbox_line
|
||
|
|
else:
|
||
|
|
bbox = (
|
||
|
|
min(bbox[0], bbox_line[0]),
|
||
|
|
min(bbox[1], bbox_line[1]),
|
||
|
|
max(bbox[2], bbox_line[2]),
|
||
|
|
max(bbox[3], bbox_line[3]),
|
||
|
|
)
|
||
|
|
|
||
|
|
top += line_spacing
|
||
|
|
|
||
|
|
if bbox is None:
|
||
|
|
return xy[0], xy[1], xy[0], xy[1]
|
||
|
|
return bbox
|
||
|
|
|
||
|
|
|
||
|
|
def Draw(im, mode=None):
|
||
|
|
"""
|
||
|
|
A simple 2D drawing interface for PIL images.
|
||
|
|
|
||
|
|
:param im: The image to draw in.
|
||
|
|
:param mode: Optional mode to use for color values. For RGB
|
||
|
|
images, this argument can be RGB or RGBA (to blend the
|
||
|
|
drawing into the image). For all other modes, this argument
|
||
|
|
must be the same as the image mode. If omitted, the mode
|
||
|
|
defaults to the mode of the image.
|
||
|
|
"""
|
||
|
|
try:
|
||
|
|
return im.getdraw(mode)
|
||
|
|
except AttributeError:
|
||
|
|
return ImageDraw(im, mode)
|
||
|
|
|
||
|
|
|
||
|
|
# experimental access to the outline API
|
||
|
|
try:
|
||
|
|
Outline = Image.core.outline
|
||
|
|
except AttributeError:
|
||
|
|
Outline = None
|
||
|
|
|
||
|
|
|
||
|
|
def getdraw(im=None, hints=None):
|
||
|
|
"""
|
||
|
|
(Experimental) A more advanced 2D drawing interface for PIL images,
|
||
|
|
based on the WCK interface.
|
||
|
|
|
||
|
|
:param im: The image to draw in.
|
||
|
|
:param hints: An optional list of hints.
|
||
|
|
:returns: A (drawing context, drawing resource factory) tuple.
|
||
|
|
"""
|
||
|
|
# FIXME: this needs more work!
|
||
|
|
# FIXME: come up with a better 'hints' scheme.
|
||
|
|
handler = None
|
||
|
|
if not hints or "nicest" in hints:
|
||
|
|
try:
|
||
|
|
from . import _imagingagg as handler
|
||
|
|
except ImportError:
|
||
|
|
pass
|
||
|
|
if handler is None:
|
||
|
|
from . import ImageDraw2 as handler
|
||
|
|
if im:
|
||
|
|
im = handler.Draw(im)
|
||
|
|
return im, handler
|
||
|
|
|
||
|
|
|
||
|
|
def floodfill(image, xy, value, border=None, thresh=0):
|
||
|
|
"""
|
||
|
|
(experimental) Fills a bounded region with a given color.
|
||
|
|
|
||
|
|
:param image: Target image.
|
||
|
|
:param xy: Seed position (a 2-item coordinate tuple). See
|
||
|
|
:ref:`coordinate-system`.
|
||
|
|
:param value: Fill color.
|
||
|
|
:param border: Optional border value. If given, the region consists of
|
||
|
|
pixels with a color different from the border color. If not given,
|
||
|
|
the region consists of pixels having the same color as the seed
|
||
|
|
pixel.
|
||
|
|
:param thresh: Optional threshold value which specifies a maximum
|
||
|
|
tolerable difference of a pixel value from the 'background' in
|
||
|
|
order for it to be replaced. Useful for filling regions of
|
||
|
|
non-homogeneous, but similar, colors.
|
||
|
|
"""
|
||
|
|
# based on an implementation by Eric S. Raymond
|
||
|
|
# amended by yo1995 @20180806
|
||
|
|
pixel = image.load()
|
||
|
|
x, y = xy
|
||
|
|
try:
|
||
|
|
background = pixel[x, y]
|
||
|
|
if _color_diff(value, background) <= thresh:
|
||
|
|
return # seed point already has fill color
|
||
|
|
pixel[x, y] = value
|
||
|
|
except (ValueError, IndexError):
|
||
|
|
return # seed point outside image
|
||
|
|
edge = {(x, y)}
|
||
|
|
# use a set to keep record of current and previous edge pixels
|
||
|
|
# to reduce memory consumption
|
||
|
|
full_edge = set()
|
||
|
|
while edge:
|
||
|
|
new_edge = set()
|
||
|
|
for (x, y) in edge: # 4 adjacent method
|
||
|
|
for (s, t) in ((x + 1, y), (x - 1, y), (x, y + 1), (x, y - 1)):
|
||
|
|
# If already processed, or if a coordinate is negative, skip
|
||
|
|
if (s, t) in full_edge or s < 0 or t < 0:
|
||
|
|
continue
|
||
|
|
try:
|
||
|
|
p = pixel[s, t]
|
||
|
|
except (ValueError, IndexError):
|
||
|
|
pass
|
||
|
|
else:
|
||
|
|
full_edge.add((s, t))
|
||
|
|
if border is None:
|
||
|
|
fill = _color_diff(p, background) <= thresh
|
||
|
|
else:
|
||
|
|
fill = p != value and p != border
|
||
|
|
if fill:
|
||
|
|
pixel[s, t] = value
|
||
|
|
new_edge.add((s, t))
|
||
|
|
full_edge = edge # discard pixels processed
|
||
|
|
edge = new_edge
|
||
|
|
|
||
|
|
|
||
|
|
def _compute_regular_polygon_vertices(bounding_circle, n_sides, rotation):
|
||
|
|
"""
|
||
|
|
Generate a list of vertices for a 2D regular polygon.
|
||
|
|
|
||
|
|
:param bounding_circle: The bounding circle is a tuple defined
|
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|
|
by a point and radius. The polygon is inscribed in this circle.
|
||
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|
(e.g. ``bounding_circle=(x, y, r)`` or ``((x, y), r)``)
|
||
|
|
:param n_sides: Number of sides
|
||
|
|
(e.g. ``n_sides=3`` for a triangle, ``6`` for a hexagon)
|
||
|
|
:param rotation: Apply an arbitrary rotation to the polygon
|
||
|
|
(e.g. ``rotation=90``, applies a 90 degree rotation)
|
||
|
|
:return: List of regular polygon vertices
|
||
|
|
(e.g. ``[(25, 50), (50, 50), (50, 25), (25, 25)]``)
|
||
|
|
|
||
|
|
How are the vertices computed?
|
||
|
|
1. Compute the following variables
|
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|
|
- theta: Angle between the apothem & the nearest polygon vertex
|
||
|
|
- side_length: Length of each polygon edge
|
||
|
|
- centroid: Center of bounding circle (1st, 2nd elements of bounding_circle)
|
||
|
|
- polygon_radius: Polygon radius (last element of bounding_circle)
|
||
|
|
- angles: Location of each polygon vertex in polar grid
|
||
|
|
(e.g. A square with 0 degree rotation => [225.0, 315.0, 45.0, 135.0])
|
||
|
|
|
||
|
|
2. For each angle in angles, get the polygon vertex at that angle
|
||
|
|
The vertex is computed using the equation below.
|
||
|
|
X= xcos(φ) + ysin(φ)
|
||
|
|
Y= −xsin(φ) + ycos(φ)
|
||
|
|
|
||
|
|
Note:
|
||
|
|
φ = angle in degrees
|
||
|
|
x = 0
|
||
|
|
y = polygon_radius
|
||
|
|
|
||
|
|
The formula above assumes rotation around the origin.
|
||
|
|
In our case, we are rotating around the centroid.
|
||
|
|
To account for this, we use the formula below
|
||
|
|
X = xcos(φ) + ysin(φ) + centroid_x
|
||
|
|
Y = −xsin(φ) + ycos(φ) + centroid_y
|
||
|
|
"""
|
||
|
|
# 1. Error Handling
|
||
|
|
# 1.1 Check `n_sides` has an appropriate value
|
||
|
|
if not isinstance(n_sides, int):
|
||
|
|
raise TypeError("n_sides should be an int")
|
||
|
|
if n_sides < 3:
|
||
|
|
raise ValueError("n_sides should be an int > 2")
|
||
|
|
|
||
|
|
# 1.2 Check `bounding_circle` has an appropriate value
|
||
|
|
if not isinstance(bounding_circle, (list, tuple)):
|
||
|
|
raise TypeError("bounding_circle should be a tuple")
|
||
|
|
|
||
|
|
if len(bounding_circle) == 3:
|
||
|
|
*centroid, polygon_radius = bounding_circle
|
||
|
|
elif len(bounding_circle) == 2:
|
||
|
|
centroid, polygon_radius = bounding_circle
|
||
|
|
else:
|
||
|
|
raise ValueError(
|
||
|
|
"bounding_circle should contain 2D coordinates "
|
||
|
|
"and a radius (e.g. (x, y, r) or ((x, y), r) )"
|
||
|
|
)
|
||
|
|
|
||
|
|
if not all(isinstance(i, (int, float)) for i in (*centroid, polygon_radius)):
|
||
|
|
raise ValueError("bounding_circle should only contain numeric data")
|
||
|
|
|
||
|
|
if not len(centroid) == 2:
|
||
|
|
raise ValueError(
|
||
|
|
"bounding_circle centre should contain 2D coordinates (e.g. (x, y))"
|
||
|
|
)
|
||
|
|
|
||
|
|
if polygon_radius <= 0:
|
||
|
|
raise ValueError("bounding_circle radius should be > 0")
|
||
|
|
|
||
|
|
# 1.3 Check `rotation` has an appropriate value
|
||
|
|
if not isinstance(rotation, (int, float)):
|
||
|
|
raise ValueError("rotation should be an int or float")
|
||
|
|
|
||
|
|
# 2. Define Helper Functions
|
||
|
|
def _apply_rotation(point, degrees, centroid):
|
||
|
|
return (
|
||
|
|
round(
|
||
|
|
point[0] * math.cos(math.radians(360 - degrees))
|
||
|
|
- point[1] * math.sin(math.radians(360 - degrees))
|
||
|
|
+ centroid[0],
|
||
|
|
2,
|
||
|
|
),
|
||
|
|
round(
|
||
|
|
point[1] * math.cos(math.radians(360 - degrees))
|
||
|
|
+ point[0] * math.sin(math.radians(360 - degrees))
|
||
|
|
+ centroid[1],
|
||
|
|
2,
|
||
|
|
),
|
||
|
|
)
|
||
|
|
|
||
|
|
def _compute_polygon_vertex(centroid, polygon_radius, angle):
|
||
|
|
start_point = [polygon_radius, 0]
|
||
|
|
return _apply_rotation(start_point, angle, centroid)
|
||
|
|
|
||
|
|
def _get_angles(n_sides, rotation):
|
||
|
|
angles = []
|
||
|
|
degrees = 360 / n_sides
|
||
|
|
# Start with the bottom left polygon vertex
|
||
|
|
current_angle = (270 - 0.5 * degrees) + rotation
|
||
|
|
for _ in range(0, n_sides):
|
||
|
|
angles.append(current_angle)
|
||
|
|
current_angle += degrees
|
||
|
|
if current_angle > 360:
|
||
|
|
current_angle -= 360
|
||
|
|
return angles
|
||
|
|
|
||
|
|
# 3. Variable Declarations
|
||
|
|
angles = _get_angles(n_sides, rotation)
|
||
|
|
|
||
|
|
# 4. Compute Vertices
|
||
|
|
return [
|
||
|
|
_compute_polygon_vertex(centroid, polygon_radius, angle) for angle in angles
|
||
|
|
]
|
||
|
|
|
||
|
|
|
||
|
|
def _color_diff(color1, color2):
|
||
|
|
"""
|
||
|
|
Uses 1-norm distance to calculate difference between two values.
|
||
|
|
"""
|
||
|
|
if isinstance(color2, tuple):
|
||
|
|
return sum([abs(color1[i] - color2[i]) for i in range(0, len(color2))])
|
||
|
|
else:
|
||
|
|
return abs(color1 - color2)
|